levinson



Nov. 1,1927. v 1,647,921

J. H. LEVINSON uca Filed April 15, 1927 2 Sheets-Sheet 1 INVENTOR. WWNESSES fose a/zlliepzzzsozz BY W ATTORNEY J. H. LEVINSON Nov. 1, 1 927.

LATCH 2 Sheets-Shes\t 2 Filed April 15) 1927 ZEZITNJESSES J/w w BY ATTORNEY' Patented Nov. 1,1927.

'UNITED STATES JOSEPH H. LEVINSON, OF NEW YORK, N. Y.

LATCH.

, Application filed April 15, 1927. Serial No. 184,005.

This invention relates to locks and more particularly to an attachment for latches which permits a. spring latch to be transformed into a dead lock so as to prevent possibility of movement of the latch bolt, and of means for operating the latch bolt.

My invention is particularly adapted for use In connection with a latch for dumb- Wait er doors, which permits the latch to be secured so that it cannot be manipulated from within the elevator shaft, so that it becomes a burglar proof latch and avoids the necessity of a separate bolt for positively locking the door.

My invention of course may be applied to latches for any purpose and I do not wish to be limited in the specific use of the latch but desire to cover the invention broadly for any use to which it can be put.

With these and other ob]ects in View, the invention consists in certain novel features of construction and combinations and arrangements of parts which will be more fully hereinafter described and pointed out in the claims.

In the accon'ipanying drawings- Figure 1 is a-view in elevation showing my improved latch with the attachment positioned to render it a dead lock;

Figure 2 is a view in section on the line 2-2 of Figure 1;

Figure is a view in transverse section on the line of Figure 2;

Figure 1 is a view similar to Figure 2, illustrating a modification;

Figure 5 is a view in section on the line 55 of Figure 1;

Figure 6 is a view in elevation of the attachment illustrated in Figures t and 5.

1' represents the wall of an elevator shaft and 2 a door. 3 is a latch which is secured to the door and 1- a keeper attached to the wall 1 to receive the latch bolt 5.

This latch bolt 5 has an extension 6 which moves through an opening 7 in the rear wall 8 of the latch, and a coil' spring 9 is positioned on this extension and interposed between the main portion of the latch bolt 5 and the wall 8 and serves to normally project the latch bolt forwardly.

9 represents a lever which is pivotally mounted intermediate its ends on a pin or rivet 10 secured in a latch casino 11, said lever projecting through a slot 12 in the casing and having one end 18 thereof located in a slot 14 in the latch bolt 5, so that when the outer or free end of this lever is manipulated the latch bolt canbe withdrawn. 7

The above type of latch is standard equip ment and I make no claim thereto apart from my improved attachment in combination therewith.

My improved attachment comprises a hook 15 which is pivotally secured to the end of the Wall 8 of the latch by means of a screw 16 or any other analogous device which may be removably or permanently secured to the wall'but allows pivotal movement of the hook.

Thehook is adapted to be positioned over the lever 9, as clearly shown in Figure 3, and prevents movement of the lever to release the latch bolt. Furthermore, this hook has an integral tongue 17 which when the hook is over the lever 15 is positioned in the path of movement of the latch bolt extension 6. In other words, this tongue 17 lies over the opening 7' so that the latch bolt cannot be forced by an instrument inserted betvzyeen the door and the Wall of the elevator sha t. 1

This attachment therefore not only prevents the movement of the latch moving lever but it also prevents any retrograde movement of the latch bolt itself so that it functions as a double locking means and renders the lock an absolutely dead latch.

While I have illustrated the latch as positioned at the right hand edge of the door in order that the heavier end of the hook 15 cannot possibly be disconnected from the lever by vibration or accidental movement, it is obvious that the position of the latch may be exactly reversed and the frictional engagement of the parts relied upon to hold the hook in the position into which -it is moved.

In the modification illustrated in Figures 1, 5 and 6, I disclose an attachment which may be placed upon latches already installed without altering the construction of the latch. In this form of my invention I employ a bifurcated bracket 18 with perforated base fianges 19, said bracket of a size to fit over the latch 11, and the perforations of the base flanges adapted to receive the screws which screw the latch in place so that the device may be attached by the same screws that secure the latch and do not require any additional securing means.

This bifurcated bracket 18 is formed at one end with a guide sleeve 20 of general elliptical shape, and in this guide sleeve a locking bar 21 is mounted to move. This bar 21 has a relatively heavy hook 22 at its upper end adapted to engage over the handle or lever 9 of the latch. The sleeve is provided with openings registering with the opening 7 at the end ot the latch casing, and the bar 2i has an opening 23 which is non mally out of register with said openings When the hook is in its lowermost position, shown in Figure 5. r"; flange or other projection at the lower end of the bar 21 limits the upward movement of the latter and insures a proper registration of the openings 25 23 and 7 when said bar is elevated to its highest position.

This "form of locking device which transforms an ordinary latch bolt into a dead lock operates by gravity, the hook and the bar 2i being sn icieutly Weighted to insure quick action. Hence the latch is normally a dead latch, but when it is desired to open ate the latch it is necessary to elevate the bar 21 and this can be done by engaging the lower end of the bar with the 'humb or finger of the hand at the same time the lever 9 is grasped. ll hen the parts are releas d the bar and hook will fall by gravity and prevent any retrograde movement of the bolt.

l fhile l have illustrated What l believe to be a preferred embodiment. my inven tion it is obvious that various changes and alterations might be made in the general form of the parts described Without departing from my invention and hence l do not limit myself to the precise details set forth but consider myself at liberty to make such changes and alterations as "fairly fall within earner the spirit and scope of the appended claims.

claim:

1. in combination with a spring, includ ing a latch bolt and a lever for moving the latch bolt, of a member movably connected to the casing of the latch and adapted to enthe lever and lie in the path of movement of the latch bolt to prevent movement of: the latch bolt and also movement of the lev An attachment "for latch bolts, includa bifurcated bracket, perforated base llai es on the bracket adapted to receive the sore holding the latch casing in place, and a sleeve on said bracket, a vertically movable bar in said sleeve, said sleeve and bar havin g openings adapted to register for the passage thereot of the latch bolt.

3. An attachn'icnt tor latch bolts, including a bifurcated bracket, perforated base flanges on the bracket adapted to receive the screws holding the latch casing in place, a sleeve on said bracket, a vertically movable bar in said sleeve, said sleeve and bar hav ing openings adapted to register for the passage thereof of the latch bolt, and a hook on said bar adapted to engage the latch operating means.

4. An attachment for latch bolts, including a bifurcated bracket, perforated base 'tlanges on the bracket adapted to receive the screws holding the latch casing in place, a sleeve on said bracket, a vertically movable bar in said sleeve, said sleeve and bar having openings adapted to register for the passage thereoi of the latch bolt, and a flange on the bar adapted to engage the sleeve and insure registration of said openings.

JQSEPH LEVlNSUN. 

